Rain sensor wipers

Anyone know how these work?? Where the sensor is etc?? Mine don't work anymore - last time in at audi they replaced the motor and had to re-code the car or soemthing???? Now i can be driving when its dry and it can suddenly start pelting it down and they dont come on i have to switch them on manually. My car was first build week of 2005 MY (May 04). I reckon the dealer hasbn't realised this and coded it as a 2004 MY car - assuming this is possible???

yes the reason why i asked is that i remember ages ago when cleaning my car I had the engine running with the auto wipers on and sprayed the window with a hose pipe and it didn't work - yet it worked when it rained! How can it tell the difference????? How does the sensor work through the windscreen? Is it sound, light or moisture activated??

When I had my Vauxhall Vomit the sales brochure explained how they work - but I can't remember!

I think I'm right in saying that the sensor sends out a beam, possibly infra-red. In turn it expects so much to be reflected back by the glass. If rain settles on the glass the reflected beam becomes defracted and triggers the wipe.

yes your right it will be very remote that anyone will sign it. however, if they don't then they are refusing to repair the car as without a signature on that form they aint gettin the car to repair. we will see what happens going to see the guy tomorrow.

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